Indeed this is curious.
I wonder if FP had own results on compatibility tests with their available sd card types which it could had shared with the community.
At least I don´t know of any published.
Purchasing one fiddling with troubles later is not the best solution.
At least there were tests done with 64GB cards.
But now with Android 6 there is a need again to find a good match, so this could be a good time for FP to kick in with more test results.